28 KNl'l» ANDERSEN 



(']) Rh. calypso K. And. ('); Enj^aiio; siniilar to Rii. suma- 

 Iranus, Imt with broader liorse-slioc and larger ears; forearm 

 V.)-:it>.S; third metacarpal 8o-38.3; hreadth of horse-shoe *).()- 10.^2 

 111111. — SpccjiiKiis examined: two athilts (one sknll) in the 

 Ih'itish Museum, six adults (four skulls) in tlie V. .S. National 

 Museum. 



(4) Rh. acuminatus aciiminalus Pet.; Java; allied to Rii. 

 sumatranus, but expansion below the middle of the sella rather 

 indistinct or (juite obliterated; forearm 48.5-o1 ; tliird metacarpal 

 ;io-rJ().o nun. ; breadth of horse-shoe as in Rh. sumatranus. — 

 Specimens examined: three adults (two skulls) in the IJritish 

 Museum. 



(5) Rh acuminatus audax K. And. ('^); Lomljok; similar to 

 Rh. a. acuminatus, but averaging- smaller; forearm 47-4!)..'); 

 third metacarpal ;}^i7-3o.2; breadth of horse-slioe as in Rh, a. acu- 

 miiiatus. — Specimens examined: two adults (one skull) in the 

 P)ritish Museum. 



The dentition, in all these bats, is very uniform : — Pa external 

 to the tooth-row (only in one specimen of Rh. calypso almost in 

 row); p^ and p, in contact or almost in contact (with the exception 

 just mentioned); ])- always in row, witli a small cus]). jwinting 

 inwards. 



The five forms, it will easily l)e seen , are representatives of 

 two « types » ; in one {Rh. sumatranus, circe, caUjpso) tlie 

 sella is \vY\ distinctly expanded ])elow the middle ; in the other 

 (RI I. acuminatus) the expansion of the sella is ratlier indistinct 

 or quite obliterated. The former type is distributed over Sumatra. 

 Xias, and Engano (western islands), each of tliese. islands Iiaving 

 its distinct species; the latter type is known from Java and Lomlwk 

 (eastern), either of these islands having its separate race. 



In the table below I giv(> a sunnnary of the measurements of 

 all the bats examined of this section. 



(') I'nir. Z(Kil. S(.c. l.diidtm I'.KO. II. pp. 1HI-;C>. \M'k pi. IV. li-s. IH a. I), c (17 Oct. 1 (K)); 

 "•. U. S. .\al. Miis. XXIX. 11(1. Ilio. pp. i;:.:--.'.! (7 Mar.-li I'.MWi). 

 C-!; rroc. /noi. Sdc. l.cni.hiri I'Hi;), II. ii. i:<:i (17 Ort. I'JO".). 



